:root {
    /* Light Theme (Default) */
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-sidebar: #1e293b;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --text-sidebar: #e2e8f0;
    --text-sidebar-hover: #ffffff;
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --border-color: #e5e7eb;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
    
    /* Font */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-size-base: 16px;
    --font-size-large: 18px;
    --font-size-small: 14px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.5;
}